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https://oed.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.05 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

11.08 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

228 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.052

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

5.05 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

11.26 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1016.2 KiB of 1017.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 253 KB unused
FIX
20 scripts, 253 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4PQN...: 72 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W55...: 62 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 61 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.oed.com/js/chart-3.8.0.js?version=1.53: 58 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.oed.com/js/main.js?version=1.53: unminified — 7 KB could be saved
Info::
Total unused JavaScript: 253 KB
253 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-4PQNDVV0GD&cx=c&gtm=4e64k0173 KB72 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W55924M134 KB62 KB (46%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202410.1.0/otBannerSdk.js112 KB61 KB (54%)✓3rd
https://www.oed.com/js/chart-3.8.0.js?version=1.5367 KB58 KB (89%)✓3rd
https://www.oed.com/js/main.js?version=1.5318 KB—✗3rd
https://unpkg.com/tippy.js@6.3.7/dist/tippy-bundle.umd.js19 KB—✓3rd
https://www.oed.com/js/api.js?version=1.533 KB—✓3rd
https://www.oed.com/js/idm.js?version=1.5321 KB—✗3rd
https://www.oed.com/js/common.js?version=1.533 KB—✓3rd
https://ouptag.scholarlyiq.com/ntpagetag.js4 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.oed.com/images/account-white.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.oed.com/images/logo3.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.oed.com/images/oup-logo-white.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.eu-west-1.amazonaws.com/com.idmgroup.oe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.eu-west-1.amazonaws.com/com.idmgroup.oe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.oed.com/images/oxford.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.oed.com/images/info-white.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.eu-west-1.amazonaws.com/com.idmgroup.oe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.oed.com/images/search.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.eu-west-1.amazonaws.com/com.idmgroup.oe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 184 KB
0 oversized -0 KB
19 legacy format
10 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1730ms total JS execution
REVIEW
1730ms total JS execution
Warning::
Unattributable: 448ms CPU time
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 404ms CPU time
Warning::
https://www.oed.com/?tl=true: 286ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4PQN...: 240ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W55...: 203ms CPU time
Warning::
Third-party scripts: 1730ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 23% Script Parsing & Compilation 14% Style & Layout 12% Parse HTML & CSS 3% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable448ms80ms0ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202410.1.0/otBannerSdk.js404ms236ms120ms3rd
https://www.oed.com/?tl=true286ms9ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4PQNDVV0GD&cx=c&gtm=4e64k0240ms199ms39ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W55924M203ms159ms31ms3rd
https://www.oed.com/js/jquery-3.7.1.min.js?version=1.53100ms79ms10ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js?did=019092d6-b3fd-7931-a3f3-0ec13b7939c3&data-document-language=true50ms35ms2ms3rd
B
Page Weight Inventory
63 resources · 1017 KB · 253 KB savings available
REVIEW
63 resources · 1017 KB · 253 KB savings available
Info::
Within 1MB page-weight target
Got: 1017 KB
Info::
~253 KB of savings available
Warning::
62 third-party resources (100% of weight)
63 resources · 1017.0 KiB · 62 third-party Within 1MB page-weight target
JavaScript 63% · 643.5 KiB
Image 20% · 205.9 KiB
Font 10% · 103.5 KiB
CSS 3% · 29.8 KiB
Other 2% · 25.2 KiB
Document 1% · 9.2 KiB

~253.1 KiB of savings available

Remove unused JavaScript: 253.1 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
1017 KB transferred, 63 requests
PASS
1017 KB transferred, 63 requests
Info::
Page weighs 2.7 MB (1017 KB transferred)
Warning::
JavaScript is 629 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 629 KB
Info::
63 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1017 KB / 2.4 MB budget
1017 KB transferred
63 requests
0.21 g CO2 per page load
JavaScript 629.0 KiB 62%
Images 183.9 KiB 18%
Fonts 103.5 KiB 10%
Other 35.3 KiB 3%
Other 27.3 KiB 3%
CSS 25.5 KiB 3%
HTML 8.3 KiB 1%
Other 2.5 KiB 0%
Other 1.6 KiB 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (103 KB)
PASS
3 fonts (103 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

103 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.0 s LCP 11.1 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 72 ms — font-display: swaphttps://fonts.gstatic.com/s/dmserifdisplay/v17/-nFnOHM81r4j6k0gjAW3mujVU2B2G_Bx0vrx52g.woff2-nFnOHM81r4j6k0gjAW3muj... https://fonts.gstatic.com/s/dmserifdisplay/v17/-nFnOHM81r4j6k0gjAW3mujVU2B2G_Bx0vrx52g.woff2 — 17.5 KiB — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2memtYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2 — 44.0 KiB — 75 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 72 ms
Start 781 ms
Risk FOUT — text flashes from fallback to web font
-nFnOHM81r4j6k0gjAW3muj... woff2 swap
Size 17 KB
Load time 61 ms
Start 782 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 75 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
63 requests over 1731ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.0 s LCP 11.1 shttps://oed.com// https://oed.com/ — 301 — 838 B — 120 ms — http/1.1https://www.oed.com/www.oed.com/ https://www.oed.com/ — 302 — 1.4 KiB — 124 ms — http/1.1https://www.oed.com/oauth2/authorization/transparent?p=eyJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiZGlyIn0..9sWi8hGCnsp-QTGHjtuXgA.f7gd-UKdn6RB95rtRkcmXT3kFwA5v08Cih42DzDPeepLZq3RKzzxNZojYVePZZOvnR44LKChqf8Wd2HUqpKYTwxXqBZmXek17wpMTL5jFwLZ-egISkih9uRz7GdbfYfT.sHddemvUbGH5v1z3LQHgtIC7y9M2R7PNqIniGvWeSc0www.oed.com/oauth2/authorization/tr... https://www.oed.com/oauth2/authorization/transparent?p=eyJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiZGlyIn0..9sWi8hGCnsp-QTGHjtuXgA.f7gd-UKdn6RB95rtRkcmXT3kFwA5v08Cih42DzDPeepLZq3RKzzxNZojYVePZZOvnR44LKChqf8Wd2HUqpKYTwxXqBZmXek17wpMTL5jFwLZ-egISkih9uRz7GdbfYfT.sHddemvUbGH5v1z3LQHgtIC7y9M2R7PNqIniGvWeSc0 — 302 — 1.9 KiB — 52 ms — http/1.1https://oup2-idp.sams-sigma.com/authorize?response_type=code&client_id=OED&scope=openid+profile+profile_extended+license+license_rules&state=bLkFQh8Kw24YLokrTTYaZTeShGwiiLq37bjJBMmKjXg%3D&redirect_uri=https%3A%2F%2Fwww.oed.com%2Fauth%2Flogin&nonce=0f21vEX9vf-dgwPflDwQw4MP8Ggz0ymFze-zy_7KvBM&ip_address=141.227.188.123&auth_token=eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.a5X4KPe8raXxttaZeFdzR0Hu4mcYgSSmFhk2ezcSxBFcUPw3ivW1W407BiJOPRjV-9swawSUgbQm4fBclPYkdbQbKDDyiO8ptYwycPphTfxV-0TJI1xrarG8VhLP6YeyH14uUA1fD_Q57-87BZ-QPiP4gPsmBBBXOIriZW6r5REhAquPp2HMTHOrF31nCxRqeEAPARo03eQ5dHGRA5BlRAQpi-RO2zdhFyv6RzPQ5Qf_M2IvwxhjE-ZQYPkGRmPOEf5g5XBhvOOjhTstHvCtjMZ597CvN1aLrhRkC4NkrEqiPA31X8q_NyuCVm1AvgNRgnsbW2FaMp2s_CcWGOyUqQ.JXZIFoRWu6EDzERI.6nXVQPtNS7CabqScf9D6BDep7zPi3xH8hCMWS8kHS8I16cknPePb910754U9bHi1wxnbmx2d3HWXbZ5BaLgx7GGrbuSS7b_25rgrWDMwNvo3BF0pxarzIafLG7G3Bcm5QH84Asu5sUFdxM-WkWHAOZtqcnxFs8r8L6psDF83K_PqXlLJCm7vDkjT94-vgtlluiyfccIHTw.sZpBaGrzVCGouOBC-CkTHA&prompt=noneoup2-idp.sams-sigma.com/authorize?r... https://oup2-idp.sams-sigma.com/authorize?response_type=code&client_id=OED&scope=openid+profile+profile_extended+license+license_rules&state=bLkFQh8Kw24YLokrTTYaZTeShGwiiLq37bjJBMmKjXg%3D&redirect_uri=https%3A%2F%2Fwww.oed.com%2Fauth%2Flogin&nonce=0f21vEX9vf-dgwPflDwQw4MP8Ggz0ymFze-zy_7KvBM&ip_address=141.227.188.123&auth_token=eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.a5X4KPe8raXxttaZeFdzR0Hu4mcYgSSmFhk2ezcSxBFcUPw3ivW1W407BiJOPRjV-9swawSUgbQm4fBclPYkdbQbKDDyiO8ptYwycPphTfxV-0TJI1xrarG8VhLP6YeyH14uUA1fD_Q57-87BZ-QPiP4gPsmBBBXOIriZW6r5REhAquPp2HMTHOrF31nCxRqeEAPARo03eQ5dHGRA5BlRAQpi-RO2zdhFyv6RzPQ5Qf_M2IvwxhjE-ZQYPkGRmPOEf5g5XBhvOOjhTstHvCtjMZ597CvN1aLrhRkC4NkrEqiPA31X8q_NyuCVm1AvgNRgnsbW2FaMp2s_CcWGOyUqQ.JXZIFoRWu6EDzERI.6nXVQPtNS7CabqScf9D6BDep7zPi3xH8hCMWS8kHS8I16cknPePb910754U9bHi1wxnbmx2d3HWXbZ5BaLgx7GGrbuSS7b_25rgrWDMwNvo3BF0pxarzIafLG7G3Bcm5QH84Asu5sUFdxM-WkWHAOZtqcnxFs8r8L6psDF83K_PqXlLJCm7vDkjT94-vgtlluiyfccIHTw.sZpBaGrzVCGouOBC-CkTHA&prompt=none — 302 — 608 B — 100 ms — h2https://www.oed.com/auth/login?error=login_required&state=bLkFQh8Kw24YLokrTTYaZTeShGwiiLq37bjJBMmKjXg%3Dwww.oed.com/auth/login?error=login_... https://www.oed.com/auth/login?error=login_required&state=bLkFQh8Kw24YLokrTTYaZTeShGwiiLq37bjJBMmKjXg%3D — 302 — 954 B — 44 ms — http/1.1https://www.oed.com/?tl=truewww.oed.com/?tl=true https://www.oed.com/?tl=true — 200 — 8.3 KiB — 61 ms — http/1.1https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,300;1,400;1,500;1,600;1,700;1,800&display=swapfonts.googleapis.com/css2?family=DM... https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600;1,700&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,300;1,400;1,500;1,600;1,700;1,800&display=swap — 200 — 3.8 KiB — 123 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1730ms · 467KB · $23/mo
Unattributable
Other
Costly
Execution 448ms
Transfer 0 KB
Monthly Cost $6/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 404ms
Transfer 112 KB
Unused 54%
Monthly Cost $5/mo
www.oed.com
Other
Costly
Execution 286ms
Transfer 8 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 240ms
Transfer 173 KB
Unused 42%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 203ms
Transfer 134 KB
Unused 46%
Monthly Cost $3/mo
www.oed.com
Other
Optional
Execution 100ms
Transfer 31 KB
Monthly Cost $1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 50ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 448ms and costs ~$6/month
  • cdn-ukwest.onetrust.com adds 404ms and costs ~$5/month
  • www.oed.com adds 286ms and costs ~$4/month
  • Google Tag Manager adds 240ms and costs ~$3/month
  • Google Tag Manager adds 203ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 448ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn-ukwest.onetrust.com takes 404ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

54% of cdn-ukwest.onetrust.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.oed.com takes 286ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 240ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 203ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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